STALL EO PoE. LE ENO Ss 
WILLIAM G. STRATTON, Governor 
DEPARTMENT OF REGISTRATION AND EDUCATION 
VeRA M. Binks, Director 
Pace Whar S TORY SURVEY -DIVISLON 
Haritow B. MI ts, Chief 
Volume 26 BULL E-EEN Article 1 
The Mayflies, or Ephemeroptera, 
of Illinots 
Be). ABRs 
Printed by Authority of the State of Illinois 
UPRAN AY PE LIN OTS 
May 1953 
